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Retroviral Transduction of T-cell Receptors in Mouse T-cells
Published on: October 22, 2010
CD4+ T-cell development in a mouse expressing a transgenic TCR derived from a Treg
Richard J DiPaolo1, Ethan M Shevach
1Department of Molecular Microbiology and Immunology, Saint Louis University School of Medicine, Saint Louis, MO 63104, USA. rdipaolo@slu.edu
European Journal of Immunology
|December 10, 2008
Summary
Regulatory T cells (Treg) are crucial for immune tolerance. This study reveals that a specific T-cell receptor (TCR) on Treg cells targets an unknown thymic peptide, influencing CD4(+) T-cell development.
Area of Science:
- Immunology
- T-cell biology
- Developmental immunology
Background:
- CD4(+)Foxp3(+) regulatory T cells (Treg) are essential for maintaining peripheral tolerance and modulating immune responses.
- The thymus is a primary source of Treg, but the precise signals driving Treg lineage commitment remain debated, particularly the role of T-cell receptor (TCR) specificity for self-peptides.
Purpose of the Study:
- To investigate the specificity of TCRs expressed by Treg cells.
- To determine the impact of Treg-specific TCRs on the development of CD4(+) T cells.
Main Methods:
- Generation of Treg-TCR transgenic mice.
- Analysis of CD4(+) T-cell populations in both RAG-sufficient and RAG-deficient (RAG(-/-)) transgenic mouse models.
Main Results:
- Expression of the Treg-TCR led to significant deletion (>90%) of CD4(+) T cells in RAG-sufficient mice and near-complete deletion (~100%) in RAG(-/-) mice.
- The observed T-cell deletion occurred late in thymic development, suggesting the target peptide is presented in the thymic medulla by antigen-presenting cells (APCs).
Conclusions:
- The TCR expressed by these Treg cells recognizes an unknown, naturally occurring peptide within the thymus.
- These findings provide novel insights into the mechanisms of Treg selection and T-cell development, challenging existing models.
